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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P122D >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to: Intake Airflow Valve System Description

Circuit Description
Control - Terminal 1 The output circuit is switched from ground to 12 V to activate the component.
The output is PWM controlled.
Control - Terminal 2 The output circuit is switched from ground to 12 V to activate the component.
The output is PWM controlled.
Component Description
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensor s, interprets the data and adjusts the engine actuators accordingly.
Q20 Intake Air Flow Valve The intake air flow valve of diesel engines reduces the intake air flow rate in part load operation so that a higher exhaust gas recirculation rate can be achieved.
The component is actuated by a bidirectional DC motor.
Not Activated = Open
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